Volumetric Flow Calculator
Find your max flow and safe print speed.
Enter nozzle, line width, layer height, and your hotend’s flow limit to see the max speed you can run without starving extrusion.
Flow (mm³/s) = line width × layer height × speed. Solve for speed given your flow limit.
How it’s calculated
- Volumetric flow = line width × layer height × speed.
- Max speed = flow limit ÷ (line width × layer height).
- Presets are rough: stock PTFE ~12, mid all-metal ~18, high-flow ~25 mm³/s.
Examples
- 0.45w × 0.20h, flow 18 → max speed ≈ 200 mm/s.
- 0.50w × 0.28h, flow 25 → max speed ≈ 179 mm/s.
- 0.42w × 0.16h, flow 12 → max speed ≈ 179 mm/s.
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FAQ
Why am I under-extruding below this speed?
Your real-world flow limit may be lower; try higher temps or wider lines, or reduce speed.
Does material matter?
Yes—PLA flows easier than ABS/ASA/PC. Use lower limits for high-temp or filled materials.
Report an issue
Have tested flow data for your printer/hotend? Share it and we’ll add it as a preset.